Pistorius will appeal murder conviction to South Africa's...

Oscar Pistorius, left, speaks with his defense lawyer Barry Roux at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an ... more

Oscar Pistorius, left, speaks with his defense lawyer Barry Roux at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that convicted him of murdering girlfriend Reeva Steenkamp, the Olympian's lawyer said. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius, left, speaks with his defense lawyer Barry Roux at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an ... more

Oscar Pistorius, left, speaks with his defense lawyer Barry Roux at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that convicted him of murdering girlfriend Reeva Steenkamp, the Olympian's lawyer said. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius covers his face in the dock at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that ... more

Oscar Pistorius covers his face in the dock at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that convicted him of murdering girlfriend Reeva Steenkamp, the Olympian's lawyer said. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius covers his face in the dock at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that ... more

Oscar Pistorius covers his face in the dock at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that convicted him of murdering girlfriend Reeva Steenkamp, the Olympian's lawyer said. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius sits in the dock in a courtroom at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that ... more

Oscar Pistorius sits in the dock in a courtroom at the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius wants to take his case to the Constitutional Court, challenging an appeals court that convicted him of murdering girlfriend Reeva Steenkamp, the Olympian's lawyer said. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Chief state prosecutor Gerrie Nel sits in a courtroom where Oscar Pistorius appears in the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius is expected to apply for bail following his ... more

Chief state prosecutor Gerrie Nel sits in a courtroom where Oscar Pistorius appears in the High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, left, talks with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, ... more

Oscar Pistorius, left, talks with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply ... more

Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Siphiwe Sibeko, Pool) less

Photo: Siphiwe Sibeko, POOL

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Oscar Pistorius, center, consults with his defense team in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he ... more

Oscar Pistorius, center, consults with his defense team in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, right, confers with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African ... more

Oscar Pistorius, right, confers with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his ... more

Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Themba Hadebe) less

Photo: Themba Hadebe, STF

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Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his ... more

Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Themba Hadebe) less

Photo: Themba Hadebe, STF

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Oscar Pistorius, center, consults with his defense team in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he ... more

Oscar Pistorius, center, consults with his defense team in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply ... more

Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply ... more

Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African ... more

Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African ... more

Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, right, consults with his defense lawyer Barry Roux, center, in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South ... more

Oscar Pistorius, right, consults with his defense lawyer Barry Roux, center, in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African ... more

Oscar Pistorius, right, consults with his defense lawyer Barry Roux in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius consults with legal team members in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is ... more

Oscar Pistorius consults with legal team members in a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrives at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail ... more

Oscar Pistorius arrives at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrvies at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail ... more

Oscar Pistorius arrvies at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrvies at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail ... more

Oscar Pistorius arrvies at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply ... more

Oscar Pistorius sits in the dock at a courtroom of the North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrives at a courtroom of North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail ... more

Oscar Pistorius arrives at a courtroom of North Gauteng High Court in Pretoria, South Africa, Tuesday Dec. 8, 2015. Pistorius arrived in the South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Herman Verwey, Pool) less

Photo: Herman Verwey, POOL

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Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his ... more

Oscar Pistorius arrives at the North Gauteng High Court in Pretoria, South Africa, Tuesday, Dec. 8, 2015. Pistorius arrived in a South African courtroom, where he is expected to apply for bail following his conviction for murdering girlfriend Reeva Steenkamp. (AP Photo/Themba Hadebe) less

Photo: Themba Hadebe, STF

PRETORIA, South Africa - Oscar Pistorius will try to appeal his murder conviction in South Africa's highest court, his lawyer said Tuesday, possibly extending a legal battle that began nearly three years ago when the double-amputee Olympian shot girlfriend Reeva Steenkamp to death in his home.

As Pistorius sat in the courtroom, defense lawyer Barry Roux unveiled the plan to take the sensational murder case to an 11-judge court known for abolishing the death penalty and affirming basic human rights after the 1994 end of white minority rule in South Africa.

If the Constitutional Court chooses not to hear the case, Pistorius will be back in a lower court on April 18 for the start of a sentencing process, meaning he will remain under house arrest for at least the next several months.

Pistorius had already been living under restrictions at his uncle's home in Pretoria since October after serving one year of a five-year prison sentence for manslaughter. That conviction, however, was thrown out last week when an appeals court convicted the former track star of murdering Steenkamp, a model who was in a toilet cubicle when her boyfriend fired through the door on Valentine's Day 2013.

Prosecutors said he killed her after an argument; Pistorius said he killed her by mistake, thinking there was an intruder in the house.

On Tuesday, Pistorius was granted bail of the equivalent of $692 in South African currency - he paid an amount 100 times higher when he first appeared in court for the shooting.